复合工艺橡胶沥青混合料的性能

Pavement performance of composite process rubber asphalt mixture

为了对复合工艺的橡胶沥青技术指标及其混合料路用性能进行研究,在制备橡胶改性沥青时掺入适量裂解剂,确定合理的制备温度和时间;对4种复合工艺橡胶沥青混合料的水稳定性能、低温弯曲性能及疲劳性能进行耐久性试验.结果表明:裂解剂质量分数为0.4%的橡胶沥青,以制备温度190℃,制备时间2 h为宜;掺加裂解剂的橡胶沥青混合料具有优异的高温、低温以及抗水损害性能,其动稳定度甚至是基质沥青混合料的3倍左右;复合工艺的橡胶沥青混合料具有优异的抗水损害、抗疲劳破坏性能以及抗低温弯曲性能,其弯拉破坏应变甚至高于橡胶颗粒SBS改性沥青混合料.

To investigate the technical indexes of composite process rubber asphalt and the mixture road performance, appropriate dosage of cleavage agent was added in the process of preparing mixture, and the reasonable processing temperature and time were determined. Based on the tests of water stability, low temperature bending and fatigue properties, the durabilities of 4 kinds of composite process rubber asphalt mixtures were determined. The test results show that when the dosage of cleavage agent is 0. 4%, the appropriate processing conditions of rubber modified asphalt are at 190 ~C for 2 hours. With the addition of cleavage agent, rubber asphalt mixture has excellent high temperature property, low temperature property and anti-water damage property, and the dynamic stability is about 3 times as much as that of asphalt mixture. The rubber asphalt mixture by composite process has excellent anti-water damage property, fatigue resistance and low-temperature bending performance, and the flexural tensile failure strain is even higher than that of rubber particle SBS modified asphalt mixture.